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Add selected image to tab bar item. #12

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merged 1 commit into from Aug 16, 2012
Merged

Add selected image to tab bar item. #12

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1 change: 1 addition & 0 deletions NGTabBarController/NGTabBarItem.h
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Expand Up @@ -11,6 +11,7 @@
@interface NGTabBarItem : UIControl

@property (nonatomic, strong) UIImage *image;
@property (nonatomic, strong) UIImage *selectedImage;
@property (nonatomic, copy) NSString *title;

@property (nonatomic, strong) UIColor *selectedImageTintColor;
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75 changes: 41 additions & 34 deletions NGTabBarController/NGTabBarItem.m
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Expand Up @@ -22,6 +22,7 @@ @implementation NGTabBarItem
@synthesize titleColor = _titleColor;
@synthesize selectedTitleColor = _selectedTitleColor;
@synthesize image = _image;
@synthesize selectedImage = _selectedImage;
@synthesize titleLabel = _titleLabel;

////////////////////////////////////////////////////////////////////////
Expand Down Expand Up @@ -93,40 +94,46 @@ - (void)drawRect:(CGRect)rect {

// draw either a selection gradient/glow or a regular image
if (_selectedByUser) {
// setup shadow
CGSize shadowOffset = CGSizeMake(0.0f, 1.0f);
CGFloat shadowBlur = 3.0;
CGColorRef cgShadowColor = [[UIColor blackColor] CGColor];

// setup gradient
CGFloat alpha0 = 0.8;
CGFloat alpha1 = 0.6;
CGFloat alpha2 = 0.0;
CGFloat alpha3 = 0.1;
CGFloat alpha4 = 0.5;
CGFloat locations[5] = {0,0.55,0.55,0.7,1};

CGFloat components[20] = {1,1,1,alpha0,1,1,1,alpha1,1,1,1,alpha2,1,1,1,alpha3,1,1,1,alpha4};
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGGradientRef colorGradient = CGGradientCreateWithColorComponents(colorSpace, components, locations, (size_t)5);
CGColorSpaceRelease(colorSpace);

// set shadow
CGContextSetShadowWithColor(context, shadowOffset, shadowBlur, cgShadowColor);

// set transparency layer and clip to mask
CGContextBeginTransparencyLayer(context, NULL);
CGContextClipToMask(context, imageRect, [self.image CGImage]);

// fill and end the transparency layer
CGContextSetFillColorWithColor(context, [self.selectedImageTintColor CGColor]);
CGContextFillRect(context, imageRect);
CGPoint start = CGPointMake(CGRectGetMidX(imageRect), imageRect.origin.y);
CGPoint end = CGPointMake(CGRectGetMidX(imageRect)-imageRect.size.height/4, imageRect.size.height+imageRect.origin.y);
CGContextDrawLinearGradient(context, colorGradient, end, start, 0);
CGContextEndTransparencyLayer(context);

CGGradientRelease(colorGradient);
if (self.selectedImage != nil) {
CGContextDrawImage(context, imageRect, self.selectedImage.CGImage);
}
else {
// default to shadow + gradient
// setup shadow
CGSize shadowOffset = CGSizeMake(0.0f, 1.0f);
CGFloat shadowBlur = 3.0;
CGColorRef cgShadowColor = [[UIColor blackColor] CGColor];

// setup gradient
CGFloat alpha0 = 0.8;
CGFloat alpha1 = 0.6;
CGFloat alpha2 = 0.0;
CGFloat alpha3 = 0.1;
CGFloat alpha4 = 0.5;
CGFloat locations[5] = {0,0.55,0.55,0.7,1};

CGFloat components[20] = {1,1,1,alpha0,1,1,1,alpha1,1,1,1,alpha2,1,1,1,alpha3,1,1,1,alpha4};
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGGradientRef colorGradient = CGGradientCreateWithColorComponents(colorSpace, components, locations, (size_t)5);
CGColorSpaceRelease(colorSpace);

// set shadow
CGContextSetShadowWithColor(context, shadowOffset, shadowBlur, cgShadowColor);

// set transparency layer and clip to mask
CGContextBeginTransparencyLayer(context, NULL);
CGContextClipToMask(context, imageRect, [self.image CGImage]);

// fill and end the transparency layer
CGContextSetFillColorWithColor(context, [self.selectedImageTintColor CGColor]);
CGContextFillRect(context, imageRect);
CGPoint start = CGPointMake(CGRectGetMidX(imageRect), imageRect.origin.y);
CGPoint end = CGPointMake(CGRectGetMidX(imageRect)-imageRect.size.height/4, imageRect.size.height+imageRect.origin.y);
CGContextDrawLinearGradient(context, colorGradient, end, start, 0);
CGContextEndTransparencyLayer(context);

CGGradientRelease(colorGradient);
}
} else {
CGContextDrawImage(context, imageRect, self.image.CGImage);
}
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